Overview

These addresses each read a pair of 8 bit pot counters.
(4 counters total). The bit assignment for both addresses is shown
below. The counters are stopped by signals from 2 controller
connectors (left-right) with 2 pins each.

Bit

15

14

13

12

11

10

09

08

07

06

05

04

03

02

01

00

RIGHT

Y7

Y6

Y5

Y4

Y3

Y2

Y1

Y0

X7

X6

X5

X4

X3

X2

X1

X0

LEFT

Y7

Y6

Y5

Y4

Y3

Y2

Y1

Y0

X7

X6

X5

X4

X3

X2

X1

X0

Connector

Paula

Loc.

Dir.

Sym.

Pin

Pin

RIGHT

Y

RX

9

33

RIGHT

X

RX

5

32

LEFT

Y

LY

9

36

LEFT

X

LX

5

35

With normal (NTSC or PAL) horiz. line rate, the pots will give a full
scale (FF) reading with about 500kohms in one frame time. With
proportionally faster horiz line times, the counters will count
proportionally faster. This should be noted when doing variable
beam displays.